逆流双效精馏节能率的模拟研究

以乙醇-水为物系,通过模拟计算,研究进料组成和进料温度对三种逆流双效精馏节能效果的影响.研究结果表明,逆流双效精馏B流程的节能效果最好,当进料中轻重组分的含量相当时,节能率高达49.83%.逆流双效精馏C流程的节能效果次之,逆流双效精馏A流程的节能效果最低,这两种流程最好应用在进料中轻组分含量大于重组分含量的条件下.三种逆流双效精馏流程的节能率均随着进料温度的升高而下降,因此逆流双效精馏最好应用在进料温度小于泡点温度的情况下.

Research on the Energy-saving Efficiency of the Backward-feed Double-effect Distillation

The effects of the feed composition and the feed temperature on the energy-saving efficiency of the backward-feed two-effect distillation are researched in ethanol-water system by process simulation.The following results are obtained.As to the energy-saving efficiency,the backward-feed B flow is best,the backward-feed C flow is better and the third is the backward-feed A flow.When the feed contain nearly the equal moles of light and heavy component,the energy-saving efficiency reach the maximum value of 49.83% for the backward-feed B flow.And the backward-feed C flow and A flow are better used at the conditions of the feed containing more light component.For the three backward-feed flows,the energy-saving efficiency all decrease with the increase of the feed temperature.They are better used at the conditions of the feed temperature being lower than the bubble point temperature.